387 lines
9.9 KiB
C++
387 lines
9.9 KiB
C++
/*
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* BLEUUID.cpp
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*
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* Created on: Jun 21, 2017
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* Author: kolban
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*/
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#include "sdkconfig.h"
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#if defined(CONFIG_BT_ENABLED)
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#include <string.h>
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#include <sstream>
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#include <iomanip>
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#include <stdio.h>
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#include <assert.h>
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#include <stdlib.h>
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#include "BLEUUID.h"
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#include "esp32-hal-log.h"
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/**
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* @brief Copy memory from source to target but in reverse order.
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*
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* When we move memory from one location it is normally:
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*
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* ```
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* [0][1][2]...[n] -> [0][1][2]...[n]
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* ```
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*
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* with this function, it is:
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*
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* ```
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* [0][1][2]...[n] -> [n][n-1][n-2]...[0]
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* ```
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*
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* @param [in] target The target of the copy
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* @param [in] source The source of the copy
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* @param [in] size The number of bytes to copy
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*/
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static void memrcpy(uint8_t* target, uint8_t* source, uint32_t size) {
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assert(size > 0);
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target += (size - 1); // Point target to the last byte of the target data
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while (size > 0) {
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*target = *source;
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target--;
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source++;
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size--;
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}
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} // memrcpy
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/**
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* @brief Create a UUID from a string.
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*
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* Create a UUID from a string. There will be two possible stories here. Either the string represents
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* a binary data field or the string represents a hex encoding of a UUID.
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* For the hex encoding, here is an example:
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*
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* ```
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* "beb5483e-36e1-4688-b7f5-ea07361b26a8"
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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* 12345678-90ab-cdef-1234-567890abcdef
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* ```
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*
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* This has a length of 36 characters. We need to parse this into 16 bytes.
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*
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* @param [in] value The string to build a UUID from.
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*/
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BLEUUID::BLEUUID(std::string value) {
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m_valueSet = true;
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if (value.length() == 4) {
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m_uuid.len = ESP_UUID_LEN_16;
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m_uuid.uuid.uuid16 = 0;
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for(int i=0;i<value.length();){
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uint8_t MSB = value.c_str()[i];
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uint8_t LSB = value.c_str()[i+1];
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if(MSB > '9') MSB -= 7;
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if(LSB > '9') LSB -= 7;
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m_uuid.uuid.uuid16 += (((MSB&0x0F) <<4) | (LSB & 0x0F))<<(2-i)*4;
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i+=2;
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}
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}
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else if (value.length() == 8) {
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m_uuid.len = ESP_UUID_LEN_32;
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m_uuid.uuid.uuid32 = 0;
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for(int i=0;i<value.length();){
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uint8_t MSB = value.c_str()[i];
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uint8_t LSB = value.c_str()[i+1];
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if(MSB > '9') MSB -= 7;
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if(LSB > '9') LSB -= 7;
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m_uuid.uuid.uuid32 += (((MSB&0x0F) <<4) | (LSB & 0x0F))<<(6-i)*4;
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i+=2;
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}
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}
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else if (value.length() == 16) { // how we can have 16 byte length string reprezenting 128 bit uuid??? needs to be investigated (lack of time)
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m_uuid.len = ESP_UUID_LEN_128;
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memrcpy(m_uuid.uuid.uuid128, (uint8_t*)value.data(), 16);
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}
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else if (value.length() == 36) {
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// If the length of the string is 36 bytes then we will assume it is a long hex string in
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// UUID format.
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m_uuid.len = ESP_UUID_LEN_128;
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int n = 0;
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for(int i=0;i<value.length();){
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if(value.c_str()[i] == '-')
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i++;
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uint8_t MSB = value.c_str()[i];
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uint8_t LSB = value.c_str()[i+1];
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if(MSB > '9') MSB -= 7;
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if(LSB > '9') LSB -= 7;
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m_uuid.uuid.uuid128[15-n++] = ((MSB&0x0F) <<4) | (LSB & 0x0F);
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i+=2;
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}
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}
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else {
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log_e("ERROR: UUID value not 2, 4, 16 or 36 bytes");
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m_valueSet = false;
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}
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} //BLEUUID(std::string)
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/**
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* @brief Create a UUID from 16 bytes of memory.
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*
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* @param [in] pData The pointer to the start of the UUID.
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* @param [in] size The size of the data.
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* @param [in] msbFirst Is the MSB first in pData memory?
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*/
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BLEUUID::BLEUUID(uint8_t* pData, size_t size, bool msbFirst) {
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if (size != 16) {
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log_e("ERROR: UUID length not 16 bytes");
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return;
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}
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m_uuid.len = ESP_UUID_LEN_128;
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if (msbFirst) {
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memrcpy(m_uuid.uuid.uuid128, pData, 16);
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} else {
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memcpy(m_uuid.uuid.uuid128, pData, 16);
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}
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m_valueSet = true;
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} // BLEUUID
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/**
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* @brief Create a UUID from the 16bit value.
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*
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* @param [in] uuid The 16bit short form UUID.
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*/
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BLEUUID::BLEUUID(uint16_t uuid) {
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m_uuid.len = ESP_UUID_LEN_16;
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m_uuid.uuid.uuid16 = uuid;
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m_valueSet = true;
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} // BLEUUID
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/**
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* @brief Create a UUID from the 32bit value.
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*
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* @param [in] uuid The 32bit short form UUID.
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*/
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BLEUUID::BLEUUID(uint32_t uuid) {
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m_uuid.len = ESP_UUID_LEN_32;
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m_uuid.uuid.uuid32 = uuid;
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m_valueSet = true;
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} // BLEUUID
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/**
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* @brief Create a UUID from the native UUID.
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*
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* @param [in] uuid The native UUID.
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*/
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BLEUUID::BLEUUID(esp_bt_uuid_t uuid) {
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m_uuid = uuid;
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m_valueSet = true;
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} // BLEUUID
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/**
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* @brief Create a UUID from the ESP32 esp_gat_id_t.
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*
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* @param [in] gattId The data to create the UUID from.
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*/
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BLEUUID::BLEUUID(esp_gatt_id_t gattId) : BLEUUID(gattId.uuid) {
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} // BLEUUID
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BLEUUID::BLEUUID() {
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m_valueSet = false;
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} // BLEUUID
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/**
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* @brief Get the number of bits in this uuid.
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* @return The number of bits in the UUID. One of 16, 32 or 128.
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*/
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uint8_t BLEUUID::bitSize() {
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if (!m_valueSet) return 0;
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switch (m_uuid.len) {
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case ESP_UUID_LEN_16:
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return 16;
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case ESP_UUID_LEN_32:
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return 32;
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case ESP_UUID_LEN_128:
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return 128;
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default:
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log_e("Unknown UUID length: %d", m_uuid.len);
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return 0;
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} // End of switch
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} // bitSize
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/**
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* @brief Compare a UUID against this UUID.
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*
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* @param [in] uuid The UUID to compare against.
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* @return True if the UUIDs are equal and false otherwise.
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*/
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bool BLEUUID::equals(BLEUUID uuid) {
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//log_d("Comparing: %s to %s", toString().c_str(), uuid.toString().c_str());
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if (!m_valueSet || !uuid.m_valueSet) return false;
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if (uuid.m_uuid.len != m_uuid.len) {
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return uuid.toString() == toString();
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}
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if (uuid.m_uuid.len == ESP_UUID_LEN_16) {
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return uuid.m_uuid.uuid.uuid16 == m_uuid.uuid.uuid16;
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}
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if (uuid.m_uuid.len == ESP_UUID_LEN_32) {
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return uuid.m_uuid.uuid.uuid32 == m_uuid.uuid.uuid32;
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}
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return memcmp(uuid.m_uuid.uuid.uuid128, m_uuid.uuid.uuid128, 16) == 0;
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} // equals
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/**
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* Create a BLEUUID from a string of the form:
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* 0xNNNN
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* 0xNNNNNNNN
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* 0x<UUID>
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* NNNN
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* NNNNNNNN
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* <UUID>
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*/
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BLEUUID BLEUUID::fromString(std::string _uuid) {
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uint8_t start = 0;
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if (strstr(_uuid.c_str(), "0x") != nullptr) { // If the string starts with 0x, skip those characters.
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start = 2;
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}
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uint8_t len = _uuid.length() - start; // Calculate the length of the string we are going to use.
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if(len == 4) {
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uint16_t x = strtoul(_uuid.substr(start, len).c_str(), NULL, 16);
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return BLEUUID(x);
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} else if (len == 8) {
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uint32_t x = strtoul(_uuid.substr(start, len).c_str(), NULL, 16);
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return BLEUUID(x);
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} else if (len == 36) {
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return BLEUUID(_uuid);
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}
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return BLEUUID();
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} // fromString
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/**
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* @brief Get the native UUID value.
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*
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* @return The native UUID value or NULL if not set.
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*/
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esp_bt_uuid_t* BLEUUID::getNative() {
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//log_d(">> getNative()")
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if (m_valueSet == false) {
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log_v("<< Return of un-initialized UUID!");
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return nullptr;
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}
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//log_d("<< getNative()");
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return &m_uuid;
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} // getNative
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/**
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* @brief Convert a UUID to its 128 bit representation.
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*
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* A UUID can be internally represented as 16bit, 32bit or the full 128bit. This method
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* will convert 16 or 32 bit representations to the full 128bit.
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*/
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BLEUUID BLEUUID::to128() {
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//log_v(">> toFull() - %s", toString().c_str());
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// If we either don't have a value or are already a 128 bit UUID, nothing further to do.
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if (!m_valueSet || m_uuid.len == ESP_UUID_LEN_128) {
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return *this;
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}
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// If we are 16 bit or 32 bit, then set the 4 bytes of the variable part of the UUID.
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if (m_uuid.len == ESP_UUID_LEN_16) {
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uint16_t temp = m_uuid.uuid.uuid16;
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m_uuid.uuid.uuid128[15] = 0;
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m_uuid.uuid.uuid128[14] = 0;
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m_uuid.uuid.uuid128[13] = (temp >> 8) & 0xff;
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m_uuid.uuid.uuid128[12] = temp & 0xff;
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}
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else if (m_uuid.len == ESP_UUID_LEN_32) {
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uint32_t temp = m_uuid.uuid.uuid32;
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m_uuid.uuid.uuid128[15] = (temp >> 24) & 0xff;
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m_uuid.uuid.uuid128[14] = (temp >> 16) & 0xff;
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m_uuid.uuid.uuid128[13] = (temp >> 8) & 0xff;
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m_uuid.uuid.uuid128[12] = temp & 0xff;
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}
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// Set the fixed parts of the UUID.
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m_uuid.uuid.uuid128[11] = 0x00;
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m_uuid.uuid.uuid128[10] = 0x00;
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m_uuid.uuid.uuid128[9] = 0x10;
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m_uuid.uuid.uuid128[8] = 0x00;
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m_uuid.uuid.uuid128[7] = 0x80;
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m_uuid.uuid.uuid128[6] = 0x00;
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m_uuid.uuid.uuid128[5] = 0x00;
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m_uuid.uuid.uuid128[4] = 0x80;
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m_uuid.uuid.uuid128[3] = 0x5f;
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m_uuid.uuid.uuid128[2] = 0x9b;
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m_uuid.uuid.uuid128[1] = 0x34;
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m_uuid.uuid.uuid128[0] = 0xfb;
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m_uuid.len = ESP_UUID_LEN_128;
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//log_d("<< toFull <- %s", toString().c_str());
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return *this;
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} // to128
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/**
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* @brief Get a string representation of the UUID.
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*
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* The format of a string is:
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* 01234567 8901 2345 6789 012345678901
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* 0000180d-0000-1000-8000-00805f9b34fb
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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*
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* @return A string representation of the UUID.
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*/
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std::string BLEUUID::toString() {
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if (!m_valueSet) return "<NULL>"; // If we have no value, nothing to format.
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// If the UUIDs are 16 or 32 bit, pad correctly.
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if (m_uuid.len == ESP_UUID_LEN_16) { // If the UUID is 16bit, pad correctly.
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char hex[9];
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snprintf(hex, sizeof(hex), "%08x", m_uuid.uuid.uuid16);
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return std::string(hex) + "-0000-1000-8000-00805f9b34fb";
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} // End 16bit UUID
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if (m_uuid.len == ESP_UUID_LEN_32) { // If the UUID is 32bit, pad correctly.
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char hex[9];
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snprintf(hex, sizeof(hex), "%08x", m_uuid.uuid.uuid32);
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return std::string(hex) + "-0000-1000-8000-00805f9b34fb";
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} // End 32bit UUID
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// The UUID is not 16bit or 32bit which means that it is 128bit.
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//
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// UUID string format:
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// AABBCCDD-EEFF-GGHH-IIJJ-KKLLMMNNOOPP
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auto size = 37; // 32 for UUID data, 4 for '-' delimiters and one for a terminator == 37 chars
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char *hex = (char *)malloc(size);
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snprintf(hex, size, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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m_uuid.uuid.uuid128[15], m_uuid.uuid.uuid128[14],
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m_uuid.uuid.uuid128[13], m_uuid.uuid.uuid128[12],
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m_uuid.uuid.uuid128[11], m_uuid.uuid.uuid128[10],
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m_uuid.uuid.uuid128[9], m_uuid.uuid.uuid128[8],
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m_uuid.uuid.uuid128[7], m_uuid.uuid.uuid128[6],
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m_uuid.uuid.uuid128[5], m_uuid.uuid.uuid128[4],
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m_uuid.uuid.uuid128[3], m_uuid.uuid.uuid128[2],
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m_uuid.uuid.uuid128[1], m_uuid.uuid.uuid128[0]);
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std::string res(hex);
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free(hex);
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return res;
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} // toString
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#endif /* CONFIG_BT_ENABLED */
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